One man was killed and another was in jail Wednesday after a fatal stabbing in Oceanside the night before, authorities said.

The incident, initially reported as a fight, happened about 8:30 p.m. Tuesday near the Rodeway Inn at state Route 76 and Coast Highway, police Lt. Ron Hardy said.

Several people at a nearby restaurant ran to the victim’s aid, a police sergeant said. A man legally permitted to carry a concealed weapon saw the assault and stopped it. The witness had the suspect prone on the ground when police arrived, Hardy said.